free(ann,slot(time(5,0),time(7,0))).
free(ann,slot(time(10,0),time(11,0))).
free(ann,slot(time(13,0),time(15,0))).

free(bob,slot(time(6,0),time(8,0))).
free(bob,slot(time(9,0),time(12,0))).
free(bob,slot(time(14,0),time(16,0))).
